Allow pathRestricted param in RestGetDataStreamsAction (elastic#112434)

This is a follow-up of elastic#112303 which prohibited this parameter. This
resulted in test failures on serverless.

Author: nielsbauman

modules/data-streams/src/main/java/org/elasticsearch/datastreams/rest/RestGetDataStreamsAction.java

@@ -66,6 +66,7 @@ public Set<String> supportedQueryParameters() {
             "include_defaults",
             "timeout",
             "master_timeout",
+            RestRequest.PATH_RESTRICTED,
             IndicesOptions.WildcardOptions.EXPAND_WILDCARDS,
             IndicesOptions.ConcreteTargetOptions.IGNORE_UNAVAILABLE,
             IndicesOptions.WildcardOptions.ALLOW_NO_INDICES,